WO2021068363A1 - High-voltage protection system for internal combustion locomotive - Google Patents

High-voltage protection system for internal combustion locomotive Download PDF

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Publication number
WO2021068363A1
WO2021068363A1 PCT/CN2019/119864 CN2019119864W WO2021068363A1 WO 2021068363 A1 WO2021068363 A1 WO 2021068363A1 CN 2019119864 W CN2019119864 W CN 2019119864W WO 2021068363 A1 WO2021068363 A1 WO 2021068363A1
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voltage
bus
resistor
discharge
circuit
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PCT/CN2019/119864
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French (fr)
Chinese (zh)
Inventor
刘谆
葸代其
杨惠兰
王武俊
柴媛
韩建宁
吕新强
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中车永济电机有限公司
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Publication of WO2021068363A1 publication Critical patent/WO2021068363A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection

Definitions

  • the invention relates to high-pressure protection of high-voltage equipment on locomotives, in particular to a high-pressure protection system for diesel locomotives.
  • the purpose of the present invention is to provide a high-voltage protection system for diesel locomotive traction-auxiliary converters, which can realize comprehensive protection functions such as power-on warning of high-voltage electrical cabinets, automatic shutdown when doors are opened, and automatic discharge when shutdown.
  • a high-voltage protection system for diesel locomotives includes a chopper discharge circuit and a cabinet door state detection circuit.
  • the chopper discharge circuit includes a bridge arm formed by two IGBTs connected in series.
  • the bridge arm is connected between the positive and negative ends of the converter cabinet bus.
  • the middle point of the bridge arm is connected to one end of the chopper braking resistor.
  • the other end is connected to the negative end of the bus; after the shutdown, before the control power is cut off, the converter cabinet control unit issues a chopping command, the chopper discharge circuit is opened, the IGBT above the bridge arm is turned on, and the energy stored in the capacitor is passed through the chopper on the locomotive.
  • the wave braking resistor quickly discharges, and the bus voltage drops below the safe voltage.
  • the cabinet door status detection circuit includes a travel switch installed at each cabinet door of the converter cabinet.
  • the travel switch is connected in series on a separate power supply circuit, and the converter cabinet control unit detects the voltage on the power supply circuit. After each cabinet door of the converter cabinet is closed, the travel switch is closed, and the control unit detects a low voltage. When any cabinet door is opened, the power supply circuit is disconnected, and the control unit detects a high voltage.
  • control unit When the control unit detects that a cabinet door is not closed when starting the machine, the control unit sends a signal to the locomotive network control system, the converter cabinet start button is invalid, and the main generator is prohibited from starting; when the power is on, the control unit detects When the cabinet door is opened, the control unit sends a signal to the locomotive network control system, and the locomotive network control system controls the converter cabinet to immediately stop and unload, and stop the main generator at the same time.
  • the slow discharge circuit includes a slow discharge resistor connected to both ends of the bus. In the event that the chopper discharge circuit fails or the control unit is powered off, the slow discharge circuit will automatically discharge the energy stored in the capacitor , To reduce the bus voltage below the safe voltage.
  • the manual discharge circuit includes a manual discharge switch and a manual discharge resistor.
  • the branch circuit after the manual discharge switch and the manual discharge resistor are connected is connected to both ends of the bus.
  • the cabinet door After the shutdown, the cabinet door needs to be opened for maintenance. Discharge through the manual discharge switch and turn on the manual discharge circuit to perform the discharge operation. It is required to turn the manual discharge switch to the discharge position to open the cabinet door. When the manual discharge switch is in the discharge position, it is not allowed to start the machine.
  • a bus voltage detection circuit which includes a bus voltage sensor, and the bus voltage sensor is connected between the positive and negative ends of the bus to detect the bus voltage.
  • the voltage signal detected by the bus voltage sensor is transmitted to the display screen of the converter cabinet, and the display screen displays the detected bus voltage.
  • the bus voltage detection circuit further includes a ground detection voltage sensor, a ground detection resistance branch, the ground detection resistance branch includes three resistors with equal resistance values connected in series, and the ground detection resistance branch is connected between the positive and negative ends of the bus ,
  • the third resistor is connected in parallel with the grounding detection voltage sensor, and the second resistor and the third resistor are grounded.
  • the signal detected by the grounding detection voltage sensor is also transmitted to the display of the converter cabinet.
  • the display shows the voltage across the detected third resistor.
  • the voltage detected by the grounding detection voltage sensor is the bus voltage sensor.
  • One-third of the detection voltage If one end of the busbar is grounded, the voltage detected by the ground detection voltage sensor changes, which can alert the staff.
  • the bus voltage detection circuit also includes a diode high-voltage warning light, which is connected to both ends of the bus, and automatically lights up when the bus voltage is higher than the safe voltage.
  • the chopper discharge circuit, the slow discharge circuit and the manual discharge circuit form the triple discharge circuit of the system.
  • the invention effectively reduces the possibility of high-pressure injury accidents, and protects personal and property safety to the greatest possible extent.
  • FIG. 1 is a block diagram of the present invention.
  • Figure 2 is the main circuit diagram of the system.
  • the high-voltage protection system of the present invention includes a control unit, a busbar voltage detection circuit, a triple discharge circuit, and a cabinet door status detection circuit.
  • the triple discharge circuit includes a chopper discharge circuit, a slow discharge circuit and a manual discharge circuit. All circuits are integrated in the traction-auxiliary circuit. In the converter.
  • the cabinet door status detection circuit is composed of a travel switch on the cabinet door of the converter cabinet.
  • the control unit detects that the cabinet door is not closed, the control unit issues an alarm to remind the staff to stop starting, and notify the locomotive network control system to prohibit the main generator from starting; when the power is on, the control unit detects the cabinet
  • the control unit issues an alarm to remind the staff to stop and unload immediately, and at the same time notify the locomotive network control system to stop the main generator.
  • the bus voltage detection circuit monitors the DC bus voltage in the high-voltage electrical cabinet in real time, and transmits the measured data to the control unit. When the voltage is higher than 50V, the high-voltage warning light automatically lights up.
  • the control unit After stopping, before the control power is cut off, the control unit issues a chopping command, the chopping circuit is opened, and the energy stored in the capacitor is quickly discharged through the chopper braking resistor on the locomotive, and the bus voltage is reduced to below 50V within 2 minutes .
  • the slow discharge circuit will automatically discharge the energy stored in the capacitor, and the bus voltage will drop below 50V within 10 minutes.
  • the cabinet door can be opened only when the manual discharge switch is in the discharge position.
  • the control unit is not allowed to start the machine.
  • Each circuit structure in the high-voltage protection system is as follows:
  • the cabinet door status detection circuit includes a travel switch installed at each cabinet door of the converter cabinet.
  • the travel switch is connected in series on the power supply circuit.
  • the control unit detects the voltage on the power supply circuit. After each cabinet door of the converter cabinet is closed, the travel switch closes and controls The unit detects a low voltage. When any cabinet door is opened, the power supply circuit is disconnected, and the control unit detects a high voltage.
  • the bus voltage detection circuit includes a bus voltage sensor, a ground detection voltage sensor, a ground detection resistance branch and a diode high-voltage warning light.
  • the bus voltage sensor is connected to the bus to detect the bus voltage
  • the ground detection resistance branch includes three series connected with equal resistance. Two resistors, the grounding detection resistor branch is connected to both ends of the bus, the third resistor is connected in parallel with the grounding detection voltage sensor, the second resistor and the third resistor are grounded, and the diode high-voltage warning light is connected to both ends of the bus. It will automatically light up when the bus voltage is higher than 50V.
  • the voltage signal detected by the bus voltage sensor is transmitted to the display of the converter cabinet, and the display shows the detected bus voltage; the signal detected by the grounding detection voltage sensor is also transmitted to the display of the converter, and the display shows the third resistance detected.
  • the voltage at both ends, when both ends of the bus are not grounded, the voltage detected by the ground detection voltage sensor is one-third of the voltage detected by the bus voltage sensor. If one end of the bus is grounded, the voltage detected by the ground detection voltage sensor changes. Can remind the staff.
  • the chopper discharge circuit includes a bridge arm formed by two IGBTs connected in series. The middle point of the bridge arm is connected to one end of the chopper braking resistor, and the other end of the chopper braking resistor is connected to the lower plate of the bus capacitor.
  • the control unit issues a chopping command, the IGBT above the chopping circuit is turned on, and the energy stored in the capacitor is quickly discharged through the chopper braking resistor, and the bus voltage is reduced to below 50V within 2 minutes.
  • the slow discharge circuit includes slow discharge resistors connected at both ends of the bus. In the event of a failure of the chopper circuit or a power failure of the control unit, the slow discharge circuit will automatically discharge the energy stored in the capacitor and reduce the bus voltage to 50V within 10 minutes the following.
  • the manual discharge circuit includes a manual discharge switch and a manual discharge resistor.
  • the branch circuit after the manual discharge switch and the manual discharge resistor are connected is connected to the two ends of the bus.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A high-voltage protection system for an internal combustion locomotive. The system comprises a control unit, a bus voltage detection circuit, a triple discharge loop, and a cabinet door state detection circuit, wherein the triple discharge loop also comprises a chopper discharge loop, a slow discharge loop and a manual discharge loop; and all the circuits are integrated in a traction-auxiliary converter. The high-voltage protection system for an internal combustion locomotive can realize comprehensive protection functions, such as high-voltage electric appliance cabinet power-on warning, automatic shutdown once a door is opened, and automatic discharge in the case of shutdown, effectively reduces the possibility of high-voltage injury accidents, and safeguards personal and property safety to the maximum extent.

Description

一种内燃机车用高压防护系统High-pressure protection system for diesel locomotive 技术领域Technical field
本发明涉及机车上高压设备的高压防护，具体为一种内燃机车用高压防护系统。The invention relates to high-pressure protection of high-voltage equipment on locomotives, in particular to a high-pressure protection system for diesel locomotives.
背景技术Background technique
随着柴油机功率和转速的不断提高,内燃机车不断向大功率发展,同时越来越多的内燃机车采用交-直-交传动方式，因此机车上装用了越来越多的高压电气设备，如变流器等等，这些设备在实现机车能量转换的过程中也带来了人身安全的隐患。目前机车上大多数高压设备的高压防护主要采用在柜门上加装警示标牌和高压指示灯，部分机车采用了慢放电阻放电，但放电时间较长，放电手段被动，整体高压防护手段单一，缺乏可靠性，未能形成一个有机的防护系统。With the continuous improvement of diesel engine power and speed, diesel locomotives continue to develop towards high power. At the same time, more and more diesel locomotives adopt AC-DC-AC transmission, so more and more high-voltage electrical equipment are installed on locomotives, such as Converters, etc., these devices also bring hidden dangers to personal safety in the process of realizing locomotive energy conversion. At present, the high-voltage protection of most high-voltage equipment on locomotives mainly adopts the installation of warning signs and high-voltage indicators on the cabinet doors. Some locomotives use slow-discharge resistance discharge, but the discharge time is longer, the discharge method is passive, and the overall high-voltage protection method is single. Lack of reliability, failed to form an organic protection system.
发明内容Summary of the invention
本发明目的就是提供一种内燃机车牵引-辅助变流器用高压防护系统，能够实现高压电器柜上电警示、开门自动停机、停机自动放电等综合保护功能。The purpose of the present invention is to provide a high-voltage protection system for diesel locomotive traction-auxiliary converters, which can realize comprehensive protection functions such as power-on warning of high-voltage electrical cabinets, automatic shutdown when doors are opened, and automatic discharge when shutdown.
本发明是采用如下的技术方案实现的：一种内燃机车用高压防护系统，包括斩波放电回路和柜门状态检测电路。The present invention is realized by adopting the following technical scheme: A high-voltage protection system for diesel locomotives includes a chopper discharge circuit and a cabinet door state detection circuit.
斩波放电回路包括由两个IGBT串接形成的桥臂，桥臂连接在变流柜母线正负端之间，桥臂的中间点连接斩波制动电阻的一端，斩波制动电阻的另一端连接母线负端；停机后在控制电断电之前，变流柜控制单元发出斩波指令，斩波放电回路开通，桥臂上方IGBT导通，存储在电容中的能量通过机车上的斩波制动电阻快速泄放，将母线电压降到安全电压以下。The chopper discharge circuit includes a bridge arm formed by two IGBTs connected in series. The bridge arm is connected between the positive and negative ends of the converter cabinet bus. The middle point of the bridge arm is connected to one end of the chopper braking resistor. The other end is connected to the negative end of the bus; after the shutdown, before the control power is cut off, the converter cabinet control unit issues a chopping command, the chopper discharge circuit is opened, the IGBT above the bridge arm is turned on, and the energy stored in the capacitor is passed through the chopper on the locomotive. The wave braking resistor quickly discharges, and the bus voltage drops below the safe voltage.
柜门状态检测电路包括安装在变流柜各个柜门处的行程开关，行程开关串接在单独的供电回路上，变流柜控制单元检测供电回路上的电压。变流柜各柜门关闭后行程开关闭合，控制单元检测到的是低电压，当有任一柜门打开时，供电回路断开，控制单元检测到的是高电压。启机时当控制单元检测到有柜门未闭合，控制单元发出信号给机车网络控制系统，变流柜启机按钮失效，并禁止主发电机启动；当上电工作过程中，控制单元检测到柜门打开， 控制单元发出信号给机车网络控制系统，机车网络控制系统控制变流柜立即停机卸载，同时停止主发电机工作。The cabinet door status detection circuit includes a travel switch installed at each cabinet door of the converter cabinet. The travel switch is connected in series on a separate power supply circuit, and the converter cabinet control unit detects the voltage on the power supply circuit. After each cabinet door of the converter cabinet is closed, the travel switch is closed, and the control unit detects a low voltage. When any cabinet door is opened, the power supply circuit is disconnected, and the control unit detects a high voltage. When the control unit detects that a cabinet door is not closed when starting the machine, the control unit sends a signal to the locomotive network control system, the converter cabinet start button is invalid, and the main generator is prohibited from starting; when the power is on, the control unit detects When the cabinet door is opened, the control unit sends a signal to the locomotive network control system, and the locomotive network control system controls the converter cabinet to immediately stop and unload, and stop the main generator at the same time.
进一步的，还包括慢放电回路，慢放电回路包括连接在母线两端的慢放电阻，在斩波放电回路失效或者控制单元断电的情况下，慢放电回路会自动泄放存储在电容中的能量，将母线电压降到安全电压以下。Further, it also includes a slow discharge circuit. The slow discharge circuit includes a slow discharge resistor connected to both ends of the bus. In the event that the chopper discharge circuit fails or the control unit is powered off, the slow discharge circuit will automatically discharge the energy stored in the capacitor , To reduce the bus voltage below the safe voltage.
进一步的，还包括手动放电回路，手动放电回路包括手动放电开关和手动放电电阻，手动放电开关和手动放电电阻连接后的支路连接在母线两端，停机后在打开柜门检修时，需要先通过手动放电开关放电，接通手动放电回路执行放电操作。要求将手动放电开关打到放电位才可以开柜门，当手动放电开关在放电位时，不允许启机。Furthermore, it also includes a manual discharge circuit. The manual discharge circuit includes a manual discharge switch and a manual discharge resistor. The branch circuit after the manual discharge switch and the manual discharge resistor are connected is connected to both ends of the bus. After the shutdown, the cabinet door needs to be opened for maintenance. Discharge through the manual discharge switch and turn on the manual discharge circuit to perform the discharge operation. It is required to turn the manual discharge switch to the discharge position to open the cabinet door. When the manual discharge switch is in the discharge position, it is not allowed to start the machine.
进一步的，还包括母线电压检测电路，母线电压检测电路包括母线电压传感器，母线电压传感器连接在母线正负端之间检测母线电压。母线电压传感器检测的电压信号传输到变流柜显示屏上，显示屏显示检测的母线电压。Further, it also includes a bus voltage detection circuit, which includes a bus voltage sensor, and the bus voltage sensor is connected between the positive and negative ends of the bus to detect the bus voltage. The voltage signal detected by the bus voltage sensor is transmitted to the display screen of the converter cabinet, and the display screen displays the detected bus voltage.
进一步的，母线电压检测电路还包括接地检测电压传感器、接地检测电阻支路，接地检测电阻支路包括串接的阻值相等的三个电阻，接地检测电阻支路连接在母线正负端之间，其中第三个电阻两端并联接地检测电压传感器，第二个电阻和第三个电阻之间接地。接地检测电压传感器检测的信号也传输到变流柜显示屏上，显示屏显示检测的第三个电阻两端的电压，当母线两端都没有接地时，接地检测电压传感器检测的电压为母线电压传感器检测电压的三分之一，若母线两端有一端接地，接地检测电压传感器检测的电压发生变化，可以提醒到工作人员。Further, the bus voltage detection circuit further includes a ground detection voltage sensor, a ground detection resistance branch, the ground detection resistance branch includes three resistors with equal resistance values connected in series, and the ground detection resistance branch is connected between the positive and negative ends of the bus , The third resistor is connected in parallel with the grounding detection voltage sensor, and the second resistor and the third resistor are grounded. The signal detected by the grounding detection voltage sensor is also transmitted to the display of the converter cabinet. The display shows the voltage across the detected third resistor. When both ends of the bus are not grounded, the voltage detected by the grounding detection voltage sensor is the bus voltage sensor. One-third of the detection voltage. If one end of the busbar is grounded, the voltage detected by the ground detection voltage sensor changes, which can alert the staff.
进一步的，母线电压检测电路还包括二极管高压警示灯，二极管高压警示灯连接在母线两端，当母线电压高于安全电压时自动亮起。Further, the bus voltage detection circuit also includes a diode high-voltage warning light, which is connected to both ends of the bus, and automatically lights up when the bus voltage is higher than the safe voltage.
进一步的，斩波放电回路、慢放电回路和手动放电回路形成该系统的三重放电回路。Further, the chopper discharge circuit, the slow discharge circuit and the manual discharge circuit form the triple discharge circuit of the system.
本发明有效地降低了发生高压伤人事故的可能性，最大可能的保护人身财产安全。The invention effectively reduces the possibility of high-pressure injury accidents, and protects personal and property safety to the greatest possible extent.
附图说明Description of the drawings
图1为本发明框图。Figure 1 is a block diagram of the present invention.
图2为系统主电路图。Figure 2 is the main circuit diagram of the system.
具体实施方式Detailed ways
本发明高压防护系统包括控制单元、母线电压检测电路、三重放电回路、柜门状态检测电路，三重放电回路又包括斩波放电回路、慢放电回路和手动放电回路，所有电路均集成在牵引-辅助变流器中。The high-voltage protection system of the present invention includes a control unit, a busbar voltage detection circuit, a triple discharge circuit, and a cabinet door status detection circuit. The triple discharge circuit includes a chopper discharge circuit, a slow discharge circuit and a manual discharge circuit. All circuits are integrated in the traction-auxiliary circuit. In the converter.
柜门状态检测电路由变流柜柜门上的行程开关组成。启机时当控制单元检测到有柜门未闭合，控制单元发出报警，提醒工作人员停止启机，并通知机车网络控制系统禁止主发电机启动；当上电工作过程中，控制单元检测到柜门打开，控制单元发出报警，提醒工作人员立即停机卸载，同时通知机车网络控制系统停止主发电机工作。The cabinet door status detection circuit is composed of a travel switch on the cabinet door of the converter cabinet. When the control unit detects that the cabinet door is not closed, the control unit issues an alarm to remind the staff to stop starting, and notify the locomotive network control system to prohibit the main generator from starting; when the power is on, the control unit detects the cabinet When the door is opened, the control unit issues an alarm to remind the staff to stop and unload immediately, and at the same time notify the locomotive network control system to stop the main generator.
启机后母线电压检测电路实时监测高压电器柜中的直流母线电压，并将测得的数据传输到控制单元，当电压高于50V时高压警示灯自动亮起。After starting the machine, the bus voltage detection circuit monitors the DC bus voltage in the high-voltage electrical cabinet in real time, and transmits the measured data to the control unit. When the voltage is higher than 50V, the high-voltage warning light automatically lights up.
停机后在控制电断电之前，控制单元发出斩波指令，斩波回路开通，存储在电容中的能量通过机车上的斩波制动电阻快速泄放，2分钟内将母线电压降到50V以下。After stopping, before the control power is cut off, the control unit issues a chopping command, the chopping circuit is opened, and the energy stored in the capacitor is quickly discharged through the chopper braking resistor on the locomotive, and the bus voltage is reduced to below 50V within 2 minutes .
在斩波放电回路失效或者控制单元断电的情况下，慢放电回路会自动泄放存储在电容中的能量，10分钟内将母线电压降到50V以下。In the event that the chopper discharge circuit fails or the control unit is powered off, the slow discharge circuit will automatically discharge the energy stored in the capacitor, and the bus voltage will drop below 50V within 10 minutes.
停机后在打开柜门检修时，需要先通过手动放电开关放电，接通手动放电回路执行放电操作。要求将手动放电开关打到放电位才可以开柜门，当手动放电开关在放电位时，控制单元不允许启机。After the shutdown, when opening the cabinet door for maintenance, it is necessary to discharge through the manual discharge switch first, and then connect the manual discharge circuit to perform the discharge operation. The cabinet door can be opened only when the manual discharge switch is in the discharge position. When the manual discharge switch is in the discharge position, the control unit is not allowed to start the machine.
高压防护系统中各电路结构具体如下：Each circuit structure in the high-voltage protection system is as follows:
柜门状态检测电路包括安装在变流柜各个柜门处的行程开关，行程开关串接在供电回路上，控制单元检测供电回路上的电压，变流柜各柜门关闭后行程开关闭合，控制单元检测到的是低电压，当有任一柜门打开时，供电回路断开，控制单元检测到的是高电压。The cabinet door status detection circuit includes a travel switch installed at each cabinet door of the converter cabinet. The travel switch is connected in series on the power supply circuit. The control unit detects the voltage on the power supply circuit. After each cabinet door of the converter cabinet is closed, the travel switch closes and controls The unit detects a low voltage. When any cabinet door is opened, the power supply circuit is disconnected, and the control unit detects a high voltage.
母线电压检测电路包括母线电压传感器、接地检测电压传感器、接地检测电阻支路和二极管高压警示灯，母线电压传感器连接在母线上检测母线电压，接地检测电阻支路包括串接的阻值相等的三个电阻，接地检测电阻支路连接在母线两端，其中第三个电阻两端并联接地检测电压传感器，第二个电 阻和第三个电阻之间接地，二极管高压警示灯连接在母线两端，当母线电压高于50V时自动亮起。母线电压传感器检测的电压信号传输到变流柜显示屏上，显示屏显示检测的母线电压；接地检测电压传感器检测的信号也传输到变流柜显示屏上，显示屏显示检测的第三个电阻两端的电压，当母线两端都没有接地时，接地检测电压传感器检测的电压为母线电压传感器检测电压的三分之一，若母线两端有一端接地，接地检测电压传感器检测的电压发生变化，可以提醒到工作人员。The bus voltage detection circuit includes a bus voltage sensor, a ground detection voltage sensor, a ground detection resistance branch and a diode high-voltage warning light. The bus voltage sensor is connected to the bus to detect the bus voltage, and the ground detection resistance branch includes three series connected with equal resistance. Two resistors, the grounding detection resistor branch is connected to both ends of the bus, the third resistor is connected in parallel with the grounding detection voltage sensor, the second resistor and the third resistor are grounded, and the diode high-voltage warning light is connected to both ends of the bus. It will automatically light up when the bus voltage is higher than 50V. The voltage signal detected by the bus voltage sensor is transmitted to the display of the converter cabinet, and the display shows the detected bus voltage; the signal detected by the grounding detection voltage sensor is also transmitted to the display of the converter, and the display shows the third resistance detected. The voltage at both ends, when both ends of the bus are not grounded, the voltage detected by the ground detection voltage sensor is one-third of the voltage detected by the bus voltage sensor. If one end of the bus is grounded, the voltage detected by the ground detection voltage sensor changes. Can remind the staff.
斩波放电回路包括由两个IGBT串接形成的桥臂，桥臂的中间点连接斩波制动电阻的一端，斩波制动电阻的另一端连接母线电容的下极板，停机后在控制电断电之前，控制单元发出斩波指令，斩波回路上方IGBT开通，存储在电容中的能量通过斩波制动电阻快速泄放，2分钟内将母线电压降到50V以下。The chopper discharge circuit includes a bridge arm formed by two IGBTs connected in series. The middle point of the bridge arm is connected to one end of the chopper braking resistor, and the other end of the chopper braking resistor is connected to the lower plate of the bus capacitor. Before the power is cut off, the control unit issues a chopping command, the IGBT above the chopping circuit is turned on, and the energy stored in the capacitor is quickly discharged through the chopper braking resistor, and the bus voltage is reduced to below 50V within 2 minutes.
慢放电回路包括连接在母线两端的慢放电阻，在斩波回路失效或者控制单元断电的情况下，慢放电回路会自动泄放存储在电容中的能量，10分钟内将母线电压降到50V以下。The slow discharge circuit includes slow discharge resistors connected at both ends of the bus. In the event of a failure of the chopper circuit or a power failure of the control unit, the slow discharge circuit will automatically discharge the energy stored in the capacitor and reduce the bus voltage to 50V within 10 minutes the following.
手动放电回路包括手动放电开关和手动放电电阻，手动放电开关和手动放电电阻连接后的支路连接在母线两端，停机后在打开柜门检修时，需要先通过手动放电开关放电，接通手动放电回路执行放电操作。要求将手动放电开关打到放电位才可以开柜门，当手动放电开关在放电位时，不允许启机。The manual discharge circuit includes a manual discharge switch and a manual discharge resistor. The branch circuit after the manual discharge switch and the manual discharge resistor are connected is connected to the two ends of the bus. After the shutdown, when the cabinet door is opened for maintenance, the manual discharge switch needs to be discharged first, and the manual is turned on. The discharge circuit performs the discharge operation. It is required to turn the manual discharge switch to the discharge position to open the cabinet door. When the manual discharge switch is in the discharge position, it is not allowed to start the machine.

Claims (7)

  1. 一种内燃机车用高压防护系统，其特征在于包括斩波放电回路和柜门状态检测电路，斩波放电回路包括由两个IGBT串接形成的桥臂，桥臂连接在变流柜母线正负端之间，桥臂的中间点连接斩波制动电阻的一端，斩波制动电阻的另一端连接母线负端；柜门状态检测电路包括安装在变流柜各个柜门处的行程开关，行程开关串接在供电回路上，变流柜控制单元检测供电回路上的电压。A high-voltage protection system for diesel locomotives, which is characterized by comprising a chopper discharge circuit and a cabinet door state detection circuit. The chopper discharge circuit includes a bridge arm formed by two IGBTs connected in series, and the bridge arm is connected to the positive and negative bus bars of the converter cabinet. Between the ends, the middle point of the bridge arm is connected to one end of the chopper brake resistor, and the other end of the chopper brake resistor is connected to the negative end of the bus; the cabinet door status detection circuit includes the travel switch installed at each cabinet door of the converter cabinet, The travel switch is connected in series on the power supply circuit, and the converter cabinet control unit detects the voltage on the power supply circuit.
  2. 根据权利要求1所述的一种内燃机车用高压防护系统，其特征在于还包括慢放电回路，慢放电回路包括连接在母线两端的慢放电阻。A high-voltage protection system for diesel locomotives according to claim 1, characterized in that it further comprises a slow discharge circuit, and the slow discharge circuit comprises a slow discharge resistor connected at both ends of the bus.
  3. 根据权利要求2所述的一种内燃机车用高压防护系统，其特征在于还包括手动放电回路，手动放电回路包括手动放电开关和手动放电电阻，手动放电开关和手动放电电阻连接后的支路连接在母线两端。The high-voltage protection system for diesel locomotives according to claim 2, characterized in that it further comprises a manual discharge circuit, the manual discharge circuit includes a manual discharge switch and a manual discharge resistor, the branch connection after the manual discharge switch and the manual discharge resistor are connected At both ends of the bus.
  4. 根据权利要求2或3所述的一种内燃机车用高压防护系统，其特征在于还包括母线电压检测电路，母线电压检测电路包括母线电压传感器，母线电压传感器连接在母线正负端之间检测母线电压。The high-voltage protection system for diesel locomotives according to claim 2 or 3, further comprising a bus voltage detection circuit, the bus voltage detection circuit includes a bus voltage sensor, and the bus voltage sensor is connected between the positive and negative ends of the bus to detect the bus Voltage.
  5. 根据权利要求4所述的一种内燃机车用高压防护系统，其特征在于母线电压检测电路还包括接地检测电压传感器、接地检测电阻支路，接地检测电阻支路包括串接的阻值相等的三个电阻，接地检测电阻支路连接在母线正负端之间，其中第三个电阻两端并联接地检测电压传感器，第二个电阻和第三个电阻之间接地。The high-voltage protection system for diesel locomotives according to claim 4, characterized in that the busbar voltage detection circuit further comprises a ground detection voltage sensor, a ground detection resistance branch, and the ground detection resistance branch includes three series connected with equal resistance. A resistor, the grounding detection resistor branch is connected between the positive and negative ends of the bus, the third resistor is connected in parallel with both ends of the grounding detection voltage sensor, and the second resistor and the third resistor are grounded.
  6. 根据权利要求4或5所述的一种内燃机车用高压防护系统，其特征在于母线电压检测电路还包括二极管高压警示灯，二极管高压警示灯连接在母线两端。The high-voltage protection system for diesel locomotives according to claim 4 or 5, wherein the bus voltage detection circuit further comprises a diode high-voltage warning light, and the diode high-voltage warning light is connected to both ends of the bus.
  7. 根据权利要求3所述的一种内燃机车用高压防护系统，其特征在于斩波放电回路、慢放电回路和手动放电回路形成该系统的三重放电回路。The high-voltage protection system for diesel locomotives according to claim 3, wherein the chopper discharge circuit, the slow discharge circuit and the manual discharge circuit form a triple discharge circuit of the system.
PCT/CN2019/119864 2019-10-12 2019-11-21 High-voltage protection system for internal combustion locomotive WO2021068363A1 (en)

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